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[5] REPLACEMENT HYDRAULIC OIL RETURN FILTER
• Various parts are at elevated temperatures immediately after engine operation. Do not
replace the filter immediately. Wait until the oil is cooled.
• The oil may spout out when the air filter of the hydraulic oil tank is removed.
Remove the air filter to relieve internal pressure by slowly rotating it first.
• Securely close the air filter after refilling.
If the air filter falls during the operation, hot oil may spout out of the pan, causing
burns.
CAUTION
• See “INSPECTION AND MAINTENANCE 6.1 USE OF LUBRICATING OIL ACCORDING TO
TEMPERATURES” for the oil to be used.
• Be sure to put the machine in the travelling posture when checking the oil level.
If you check the oil level in the working posture, you judge the oil level to be low and
feed the oil excessively.
• After replacing the filter of hydraulic oil, do not start the engine for a while until piping
and hydraulic equipment are filled with the oil.
• Do not refill oil exceeding the level gauge (H) (upper limit). When the oil goes beyond
this level, it may spout out from the air filter during traveling or crane operation.
• Be careful not to let any foreign substance go into the filler opening when refilling the
oil.
1. Place the machine on a level surface.
2. See “OPERATION 1.10 ENGINE COVER” and remove
the engine cover.
3. Remove the air filter (F) to relieve internal pressure.
4. Using a filter wrench, turn the filter cartridge (3) to the
left to remove it.
5. Clean the filter base and reinstall a new filter cartridge
(3) after coating its packing and threaded portion with
clean engine oil (or lightly with grease).
NOTES
When reinstalling the filter cartridge, tighten it 1/2 to 3/4 of
a turn after the packing surface touches the sealing
surface of the filter base.
Be sure to do it manually.
6. Start and run the engine at low idle for 10 minutes and
stop the engine to bleed the air.
7. Check around the filter cartridge (3) for oil leaks and
wipe off spilled oil.
8. See “INSPECTION AND MAINTENANCE 9.1.2
INSPECTION BEFORE STARTING ENGINE” to inspect
the oil level inside the hydraulic tank.
If there is not sufficient oil, refill it.
9. Mount the air filter (F).
10. See “OPERATION 1.10 ENGINE COVER” and install
the engine cover.
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